Pot: 6,5 cm.
A small cactus of a globular shape, which can grow both solitary and clustered at the base. Its stem is characterized by many slender, well marked ribs and by the wavy shape, from which it takes the nicknames of "Wave Cactus" or "Brain Cactus". The color of the stem is typically green, but it can take on different shades. It can have both thin and elongated spines and more robust and flattened ones, with colors, ranging from white to brownish-red.